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You can use the break command to stop iterating through a block, eg.
(simplifying your commands a bit):
 
file_namesa.txt','b.txt','c.txt']
file_names.each do  |x|
if  xb.txt'
puts 'we  already have ' + x + ' in that array  '
break
end
end

Best regards,
 
Axel 

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